1=pod 2 3=head1 NAME 4 5BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic 6functions on BIGNUMs with integers 7 8=head1 SYNOPSIS 9 10 #include <openssl/bn.h> 11 12 int BN_add_word(BIGNUM *a, BN_ULONG w); 13 14 int BN_sub_word(BIGNUM *a, BN_ULONG w); 15 16 int BN_mul_word(BIGNUM *a, BN_ULONG w); 17 18 BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w); 19 20 BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w); 21 22=head1 DESCRIPTION 23 24These functions perform arithmetic operations on BIGNUMs with unsigned 25integers. They are much more efficient than the normal BIGNUM 26arithmetic operations. 27 28BN_add_word() adds B<w> to B<a> (C<a+=w>). 29 30BN_sub_word() subtracts B<w> from B<a> (C<a-=w>). 31 32BN_mul_word() multiplies B<a> and B<w> (C<a*=w>). 33 34BN_div_word() divides B<a> by B<w> (C<a/=w>) and returns the remainder. 35 36BN_mod_word() returns the remainder of B<a> divided by B<w> (C<a%w>). 37 38For BN_div_word() and BN_mod_word(), B<w> must not be 0. 39 40=head1 RETURN VALUES 41 42BN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 43on error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. 44 45BN_mod_word() and BN_div_word() return B<a>%B<w> on success and 46B<(BN_ULONG)-1> if an error occurred. 47 48=head1 SEE ALSO 49 50L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> 51 52=head1 HISTORY 53 54BN_add_word() and BN_mod_word() are available in all versions of 55SSLeay and OpenSSL. BN_div_word() was added in SSLeay 0.8, and 56BN_sub_word() and BN_mul_word() in SSLeay 0.9.0. 57 58Before 0.9.8a the return value for BN_div_word() and BN_mod_word() 59in case of an error was 0. 60 61=cut 62